Martin KaFai Lau dc4bb0e235 bpf: Introduce bpf_prog ID ...

This patch generates an unique ID for each BPF_PROG_LOAD-ed prog.
It is worth to note that each BPF_PROG_LOAD-ed prog will have
a different ID even they have the same bpf instructions.

The ID is generated by the existing idr_alloc_cyclic().
The ID is ranged from [1, INT_MAX).  It is allocated in cyclic manner,
so an ID will get reused every 2 billion BPF_PROG_LOAD.

The bpf_prog_alloc_id() is done after bpf_prog_select_runtime()
because the jit process may have allocated a new prog.  Hence,
we need to ensure the value of pointer 'prog' will not be changed
any more before storing the prog to the prog_idr.

After bpf_prog_select_runtime(), the prog is read-only.  Hence,
the id is stored in 'struct bpf_prog_aux'.

Signed-off-by: Martin KaFai Lau <kafai@fb.com>
Acked-by: Alexei Starovoitov <ast@fb.com>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

2017-06-06 15:41:22 -04:00

..

arraymap.c

perf, bpf: Add BPF support to all perf_event types

2017-06-04 21:58:01 -04:00

bpf_lru_list.c

bpf: lru: Lower the PERCPU_NR_SCANS from 16 to 4

2017-04-17 13:55:52 -04:00

bpf_lru_list.h

bpf: Add percpu LRU list

2016-11-15 11:50:20 -05:00

cgroup.c

bpf: pass sk to helper functions

2017-04-11 14:54:19 -04:00

core.c

bpf: use different interpreter depending on required stack size

2017-05-31 19:29:48 -04:00

hashtab.c

bpf: map_get_next_key to return first key on NULL

2017-04-25 11:57:45 -04:00

helpers.c

bpf: rename ARG_PTR_TO_STACK

2017-01-09 16:56:27 -05:00

inode.c

fs: constify tree_descr arrays passed to simple_fill_super()

2017-04-26 23:54:06 -04:00

lpm_trie.c

bpf: fix wrong exposure of map_flags into fdinfo for lpm

2017-05-25 13:44:28 -04:00

Makefile

bpf: Add array of maps support

2017-03-22 15:45:45 -07:00

map_in_map.c

bpf: Add array of maps support

2017-03-22 15:45:45 -07:00

map_in_map.h

bpf: Add array of maps support

2017-03-22 15:45:45 -07:00

percpu_freelist.c

bpf: introduce percpu_freelist

2016-03-08 15:28:31 -05:00

percpu_freelist.h

bpf: introduce percpu_freelist

2016-03-08 15:28:31 -05:00

stackmap.c

bpf: fix wrong exposure of map_flags into fdinfo for lpm

2017-05-25 13:44:28 -04:00

syscall.c

bpf: Introduce bpf_prog ID

2017-06-06 15:41:22 -04:00

verifier.c

bpf: Allow CGROUP_SKB eBPF program to access sk_buff

2017-06-02 14:24:40 -04:00